CN112575011B - Biosynthesis method of nafrafine intermediate and biological enzyme - Google Patents

Abstract

The invention relates to the technical field of drug synthesis and enzyme engineering, in particular to a biological synthesis method of a nafrafine intermediate and a biological enzyme, wherein the method takes a compound II as a starting raw material, and the compound II is converted into a compound I by the biological enzyme catalysis in the presence of buffer solution, cosolvent, coenzyme PLP and amino donor, and the reaction route is as follows,

Description

Biosynthesis method of nafrafine intermediate and biological enzyme

Technical Field

The invention relates to the technical field of drug synthesis and enzyme engineering, in particular to a biosynthesis method of a nafrafine intermediate.

Background

Nalfuraphine (Nalfurafine), the finished product is usually hydrochloride, and the finished product is approved by the drug administration of China in 2019, 9, 16 days and enters the clinical test stage. Molecular weight of nalfuraphten: 476.6, respectively; CAS accession number: 152657-84-6, having the formula:

nalfurafine is Toray, a Kappa Opioid Receptor (KOR) receptor agonist, of Japan, from original research. Its soft capsule dosage form has been sold in japan since 2009, and its orally disintegrating tablet is more convenient for patients to take, and was approved and promoted in japan in 2017. The pruritus suffered by hemodialysis patients is non-inflammatory, quite common and serious in symptoms. Conventional antipruritic agents including antihistamines have been unable to suppress itching in many cases. The data show that uremic pruritus occurs at 15% -49% in patients before dialysis and at 50% -90% in patients with hemodialysis and peritoneal dialysis. The conclusion of the dialysis prognosis and practice model study (DOPPS) indicates that: about 42% of dialysis patients suffer from moderate to severe skin itching. This not only seriously affects the quality of life of the patient, but several patients even develop symptoms of anxiety, depression or insomnia. The nalfuraphine hydrochloride can be used for treating pruritus caused by uremia syndrome related to hemodialysis, and also has application in treating pruritus of chronic liver disease patients.

The introduction of chiral groups in nafrafine is of crucial importance, and a method for introducing chiral amino groups is mentioned in patent WO2010144641, and the specific route is as follows:

in the method, the introduction of chiral amino requires the participation of metal ruthenium, the reaction condition is harsh, a large amount of organic solvent is used, the chiral catalytic rate is not high, and the environment is polluted while the economic cost is increased. Therefore, a simple, easy, mild and environmentally friendly synthetic route needs to be developed.

Disclosure of Invention

The first purpose of the invention is to provide a biological enzyme.

The second object of the present invention is to provide a process for producing the above-mentioned biological enzyme.

The third purpose of the invention is to provide a method for carrying out the biosynthesis of the nalfuraphrphine intermediate by adopting the biological enzyme.

In order to achieve the purpose, the invention provides the following technical scheme:

a biological enzyme has a nucleotide sequence shown in SEQ ID NO. 1.

The preparation method of the engineering bacteria of the biological enzyme comprises the following steps:

and (3) expressing the biological enzyme gene by taking a pET-28a plasmid as a vector. The biological enzyme gene was ligated to EcoR I and Hind III sites of pET-28a plasmid and then transformed into E.coli BL21(DE3) for expression.

Specifically, after the biological enzyme gene is completely synthesized, upstream and downstream primers F1 and R1 (shown as SEQ ID NO: 2-3) are designed for PCR amplification, and the PCR conditions are as follows: 3min at 98 ℃, 30s at 95 ℃, 90s at 57 ℃, 90s at 72 ℃ and 35 cycles; PCR amplification System: 1.5. mu.L of template, 1.5. mu.L of each of the upstream and downstream primers, 20.5. mu.L of sterilized double distilled water, 25. mu.L of PrimerSTAR Mix;

purifying and recovering the PCR product by using a gel recovery kit, and carrying out electrophoresis test on the concentration of the recovered product; the method comprises the following steps of (1) carrying out enzyme digestion on a gel recovery product and a pET-28a plasmid by using EcoR I and Hind III, purifying and recovering the gel recovery product after enzyme digestion by using a gel recovery kit, purifying and recovering the plasmid after enzyme digestion by using the gel recovery kit, and carrying out electrophoresis inspection on the concentration of the recovered product; the target gene tra-07 is connected with a vector pET-28a, and the connection system is as follows: 4 mu L of target gene, 2 mu L of vector pET-28a, 2 mu L of Buffer and 1 mu L of ligase are connected at 16 ℃ overnight; introducing the constructed vector into E.coli BL21(DE3) by a transformation technology, coating the vector on an LB flat plate containing kanamycin, putting the LB flat plate into an incubator at 37 ℃ overnight, and carrying out plasmid extraction and sequencing on a single colony grown out to finally obtain a recombinant engineering bacterium containing a biological enzyme gene: engineering bacterium of Escherichia coli TRA-07.

Specifically, the preparation method of the biological enzyme comprises the step of inoculating Escherichia coli engineering bacteria TRA-07 expressing the biological enzyme into an LB liquid culture medium, wherein the inoculation amount is 1 percent of the volume of the culture medium, and the temperature is 37 DEG CNext, the mixture was used as a seed solution after overnight incubation in a shaker at 220 rpm. Inoculating fresh seed liquid into TB culture medium, fermenting and culturing at 37 deg.C, and culturing in 220rpm shaking table to OD ₆₀₀ IPTG was added to the medium at 0.6-0.8, 0.5mM, and induced at 18 ℃ for 16 h. After the induction of the fermentation liquor is finished, the fermentation liquor is centrifuged for 5min at 4 ℃ and 12000rpm, and thalli are collected. And (3) carrying out re-suspension by using a PB buffer solution with the pH value of 7.0 and the concentration of 0.2M, carrying out ultrasonic crushing, and carrying out freeze-drying to obtain freeze-dried enzyme powder.

The method for carrying out the biosynthesis of the nalfuraphorphine intermediate by adopting the biological enzyme comprises the following steps:

the compound II is used as an initial raw material, and is converted into the compound I by biological enzyme catalysis in the presence of buffer solution, cosolvent, coenzyme PLP and amino donor, the reaction route is,

wherein the mass ratio of the compound II to the biological enzyme is 1: 1-30, preferably 1: 20.

Wherein the amino donor is selected from one or more of alanine, triethanolamine, isopropylamine, propylamine, ethylamine, tryptophan, butylamine or alpha-aminoglutaric acid; isopropylamine or alanine are preferred.

Wherein the molar ratio of the compound II to the amino donor is 1: 1-10; preferably 1:1 to 5.

Wherein the buffer solution is phosphate buffer solution; preferably, the buffer solution is a phosphate buffer solution with the value of 0.1-0.2M, pH of 7.0-8.0.

Wherein the cosolvent is selected from any one of butyl acetate, methanol, ethanol and DMSO, and is preferably DMSO;

the mass volume ratio of the compound II to the cosolvent is 1: 10-100 g/ml, preferably 1: 10-50 g/ml;

the volume ratio of the cosolvent to the buffer solution is 1: 1-100, and preferably 1: 10.

Wherein the mass ratio of the biological enzyme to the coenzyme PLP is 5-30: 1, preferably 10-30: 1.

Wherein, the reaction temperature of the compound II is 0-60 ℃ when the compound II is subjected to biological enzyme catalytic reaction; preferably 20 to 40 ℃.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a biosynthesis method of a nalfuraphten intermediate, which solves the problems of long reaction time, complex synthesis process and the like of the use of a nalfuraphten chemical metal catalyst in the prior art, is environment-friendly and pollution-free and has wide application prospect.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The preparation method of the engineering bacteria of the biological enzyme (the sequence is detailed in SEQ ID NO: 1) comprises the following steps:

specifically, after the biological enzyme gene is completely synthesized, upstream and downstream primers F1 and R1 (shown as SEQ ID NO: 2-3) are designed for PCR amplification, and the PCR conditions are as follows: 3min at 98 ℃, 30s at 95 ℃, 90s at 57 ℃, 90s at 72 ℃ and 35 cycles; PCR amplification System: 1.5. mu.L of template, 1.5. mu.L of each of the upstream and downstream primers, 20.5. mu.L of sterilized double distilled water, 25. mu.L of PrimerSTAR Mix;

purifying and recovering the PCR product by using a glue recovery kit, and carrying out electrophoresis test on the concentration of the recovered product; the method comprises the following steps of (1) cutting gel recovery products and pET-28a plasmids by EcoR I and Hind III, purifying and recovering the gel recovery products after enzyme cutting by a gel recovery kit, purifying and recovering the plasmids after enzyme cutting by the gel recovery kit, and carrying out electrophoresis inspection on the concentration of the recovered products; the target gene tra-07 is connected with a vector pET-28a, and the connection system is as follows: 4 mu L of target gene, 2 mu L of vector pET-28a, 2 mu L of Buffer and 1 mu L of ligase are connected at 16 ℃ overnight; introducing the constructed vector into E.coli BL21(DE3) by a transformation technology, coating the vector on an LB (LB) plate containing kanamycin, putting the plate into an incubator at 37 ℃ overnight, and performing plasmid extraction and sequencing on a single colony grown out to finally obtain a recombinant engineering bacterium containing a biological enzyme gene: engineering bacterium of Escherichia coli TRA-07.

Escherichia coli strain TRA-07 expressing a biological enzyme (see SEQ ID NO: 1 for details) was inoculated into LB liquid medium in an amount of 1% by volume, and cultured overnight in a shaker at 37 ℃ and 220rpm, to obtain a seed solution. Inoculating fresh seed liquid into TB culture medium, fermenting and culturing at 37 deg.C, and culturing in 220rpm shaking table to OD ₆₀₀ IPTG was added to the medium at 0.6-0.8, 0.5mM, and induction was continued for 16h at 18. After the induction of the fermentation liquor is finished, the fermentation liquor is centrifuged for 5min at 4 ℃ and 12000rpm, and thalli are collected. And (3) carrying out re-suspension by using a PB buffer solution with the pH value of 7.0 and the concentration of 0.2M, carrying out ultrasonic crushing, and carrying out freeze-drying to obtain freeze-dried enzyme powder.

EXAMPLE 2 preparation of Compound I

The lyophilized enzyme powder prepared in example 1 was first dissolved and mixed with 95mL of a buffer (1M isopropylamine hydrochloride, pH8.0) to give a crude enzyme solution having a final concentration of 20g/L, and 55mL of substrate-containing LDMSO was added to the reaction system so that the final concentration of Compound II in the reaction system was 1 g/L. And finally, adding pyridoxal phosphate with the final concentration of 1mM and alanine with the final concentration of 1g/L, adjusting the pH value by 0.1% NaOH, adjusting the pH value of the system to be 8.0, reacting at 30 ℃ for 24 hours, stopping the reaction, extracting by ethyl acetate, and detecting the yield of the compound I by a liquid phase, wherein the purity is 97.3%, and the ee value is 99.1%.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Sequence listing

<110> Jiangsu alpha pharmaceutical Co., Ltd

<120> biosynthesis method of nafraforphine intermediate and biological enzyme

<160> 3

<170> SIPOSequenceListing 1.0

<210> 1

<211> 1347

<212> DNA

<213> Artificial Sequence (Artificial Sequence)

<400> 1

atcatgaatc agtctttcgt tgaaaaatcc aagcaatatc tgtggctgcc gtttacccaa 60

atgaaagatt acgatgaaaa cccgctgatc atcgaatccg gtcagggcat caaactgaaa 120

gatatcgatg gccgtgtgta ctatgacggt ttttcctctg tatggctgaa tgtgcacggt 180

catcgtaaaa aagagctgga cgaagcgatc aagaaacagc tgggcaaaat cgcccactct 240

accctgctgg gtatgaccaa tgttccggcc acggaactgg ctgaggtgct gatcaagatc 300

actccagaga atctgacccg tgtgttctac tctgacagcg gcgctaccgc tatggaaatc 360

gctctgaaga tggcttttca gtactggaaa aatatcggca aaccggaaaa gcagaagttc 420

atctccatga aaaacggcta ccacggtgat acgattggtg ctgtgtccgt tggcgccatc 480

gaactgttcc accatgttta cggtccgctg atgtttgaat ccttcaaggt taatgttccg 540

tatgtctatc gtagcaaatc cggtaacccg gatgagtgcc gtgacgagtg tctggctgaa 600

ctggagcgcc tgctgtctga acgtcatgac gaaatcgcag ctctgtctgt tgaaagcatg 660

gttcagggtg caagcggcat gattgttatg cctgaaggtt acctggcagg tgtgcgcgaa 720

ctgtgcacca aatacgacgt gctgatgatt gtggatgaag ttgcaacggg ctttggtcgt 780

actggcaaaa tgttcgcgtg cgaacatgaa cgtgttcagc cggatctgat ggcggcaggc 840

aaagctatta ccggcggtta cctgccgatc gctgttactt tcgcgactga agagatctac 900

gaagcgtttt atgatgacta caataaactg aaaacttttt tccacggcca ctcttacacg 960

ggcaaccagc tgggctgtgc tgttgcgctg gaaaacctgc gcctgtttga atctgaaaaa 1020

atcgtggcac aggttgcaga aaagtccaag atcctggaaa gcctgttcca cgatctggca 1080

gctctgccgc acgttggtga catccgtcag ctgggtttta tgagcggtat cgaactggta 1140

cagagcaagg aaacgcgtca accgtatcca ccggaagaac gtattggcta ccgtgtgtcc 1200

ctgaaaatgc gcgaactggg catgctgact cgtccactgg gtgacgttgt tgcgtttctg 1260

cctccgctgg cgtctactgc tgatgacctg cgcgccatgg tttccatcat gaaggaagct 1320

attcaggaag tgaccggtcg tgcttat 1347

<210> 2

<211> 33

<212> DNA

<213> Artificial Sequence (Artificial Sequence)

<400> 2

ggaattcatg aatcagtctt tcgttgaaaa atc 33

<210> 3

<211> 31

<212> DNA

<213> Artificial Sequence (Artificial Sequence)

<400> 3

cccaagcttt caataagcac gaccggtcac t 31

Claims (1)

1. The method for carrying out the biosynthesis of the nafrafine intermediate by adopting the biological enzyme is characterized by comprising the following steps: the nucleotide sequence of the biological enzyme is shown as SEQ ID NO. 1;

dissolving and uniformly mixing the freeze-dried enzyme powder of the biological enzyme by using 95mL of buffer solution, wherein the buffer solution is 1M isopropylamine hydrochloride and has the pH value of 8.0; the final concentration of the crude enzyme solution is 20g/L, and 55mLDMSO containing a substrate is added during reaction, so that the final concentration of a compound II in a reaction system is 1 g/L; finally, pyridoxal phosphate with the final concentration of 1mM and alanine with the final concentration of 1g/L and 0.1 percent NaOH are added to adjust the pH value of the system to be 8.0, the reaction is stopped after 24 hours of reaction at 30 ℃, the ethyl acetate is used for extraction, the reaction route is as follows,